Title:
Automatic impact indicator system for tennis
United States Patent 3415517

Inventors:
Kelvin, Krist Henry
Publication Date:
12/10/1968
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Primary Class:
473/467
Other Classes:
340/323R, 340/323B, 340/384.700, 340/686.100, 340/815.690, 273/372
International Classes:
A63B71/06
US Patent References:
3254336Sound simulation system
Foreign References:
GB418182A




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